I can't seem to find it anywhere, but I downloaded the Crunchyroll app to my iPad 4.

My issue here, and really isn't an issue, but more so a question. I bought the subscription from the app, as in through Apple. Now this didn't ask for any credit card info, nor is my card linked to this. So will this be re-occuring, or does this method work like buying a pass that ends after x amount of time?

TL;DR
Bought subscription through iPad app, will it re-occur, or do I have to manually buy more time.